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PostPosted: 17 Feb 2016, 10:39 

Joined: 20 Jan 2016, 15:13
Posts: 2
My Aim
I am working on designing synthesizers.

I only need midi in at this time.
Using a MIDI DIN, not USB, I want to be able to control the pitch (assumptive resistance based) of any basic tone generator.
The concept I envision in my mind is each key alters the resistance.

I have found this link for MIDI which seem good:

Problem is, I have no idea how it controls the pitch.

I know it can be done, because we had midi in the early 80's, and did not have complex microcontrollers in those midi's.

So I guess what I am asking is, What is the cheapest, Simplest way to make a MIDI, that works?

PostPosted: 17 Feb 2016, 18:54 

Joined: 09 Oct 2012, 19:43
Posts: 376
Location: Vancouver Canada
Hi Doomera. The question you ask is simple enough but i am afraid entails a very complex subject. The term MIDI stands for "Musical Instrument Digital Interface" the key word being interface. Working/dealing in the world of MIDI encompasses three main areas. 1-The synthesizer itself which can be digital or analogue. 2- the interface point where the outside world connects to the synthesizer. and 3- What in the outside world is going to interface and control with the synthesizer. Unfortunately there is no analogue direct interface to the synthesizer in the world of MIDI. The interface is a digital one using "3 bytes" of digital information. If, as you say, you are trying to use a keyboard to input info to the synth, then the keyboard can be analogue, but this must be converted into digital info before it can be sent threw the interface to the synth. (the use of a DIN plug is only to distinguish a midi interface standard as apposed to USB which is mostly a universal comp interface). In some cases the digital input can be fooled into thinking it is seeing a digital signal by way of analogue circuits such as the ones pointed to on the page you suggest but, that, as you can see uses 30 IC's and three power supply voltages +5,+12,-12 to accomplish the job of one processor. And it can only do the one job it is designed to do, whereas a processor can be programmed and re=programmed to accomplish many chores. The best i could suggest is, you do a lot of learning about MIDI itself first, and what it is, to then understand how it works. If you are mostly interested in building the analogue synths and controlling with analogue keyboards etc then look more specifically for the cir's themselves and leave MIDI out of the search as it just adds confusion to the mix and will always steer you away from what it is you are trying to accomlish. I hope this helps you. Laurie L.

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